Open hole staged fracturing well completion pipe string provided with controllable valve and hydraulic control switching pipe string

A staged fracturing and hydraulic control switch technology, which is applied in the direction of wellbore/well components, production fluid, wellbore/well valve device, etc., can solve the problem of restricting unconventional oil and gas resources in low permeability reservoirs, well completion and fracturing The complex structure of the integrated pipe string, the number of segments and the limitation of fracturing scale can achieve the effects of saving perforation operation cost and operation time, reducing construction cost and convenient operation

Active Publication Date: 2012-01-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently commonly used horizontal well open hole packer staged completion technology, such as: the application number 200920248979.9 of the horizontal well completion and fracturing integrated pipe string, the sliding sleeve staged fracturing technology is opened step by step by throwing balls, in order to allow input The inner diameter of the ball seat at the bottom must be smaller than the inner diameter of the ball seat at the upper level. Affected by the hierarchical arrangement of ball seat sizes, the number of stages and the scale of fracturing are different. It is greatly restricted, which affects the transformation effect; and the sliding sleeve is a ball-pitching sliding sleeve, the sliding sleeve is opened after the ball is thrown in, and it cannot be closed in later production
If selective production or repeated fracturing is to be carried out in the later stage, the sliding sleeve needs to be closed, and the integrated pipe string will not be used as a whole
The tubing fracturing string can only be rerun into the tubing string for small-scale in-pipe segmental fracturing, so it cannot meet the use requirements in the follow-up construction after the completion of the well
At the same time, the structure of the utility model integrated well completion and fracturing string is relatively complex, and it is prone to operational failures.
In the development of low-permeability reservoirs and unconventional oil and gas resources, for vertical wells with multi-stage fracturing, especially horizontal wells with complex string structures and high technical requirements, there is no casing fracturing completion method that can solve the above problems. Restricting the development of low permeability reservoirs and unconventional oil and gas resources

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  • Open hole staged fracturing well completion pipe string provided with controllable valve and hydraulic control switching pipe string
  • Open hole staged fracturing well completion pipe string provided with controllable valve and hydraulic control switching pipe string
  • Open hole staged fracturing well completion pipe string provided with controllable valve and hydraulic control switching pipe string

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0020] The open-hole staged fracturing completion string with controllable valves is connected sequentially from top to bottom with the casing 1, the drill pipe feeding tool 3, the top hanging packer 5, the hydraulic control switch retention tube 2, and the openable close control valve 4 and and It is connected with open hole fracturing packer 6 , wellbore isolation valve 8 and bottom circulation valve 7 . Connect at least one set of switchable control valves 4 and and It is connected to the open hole fracturing packer 6 . When fracturing and completing multi-stage formations, it is necessary to configure multiple sets of switchable control valves 4 and open hole fracturing packers 6 connected to them in the pipe string, and there is no need for a set of switchable control valves 4 at the bottom. Install the open hole fracturing packer 6 again.

[0021] The swit...

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Abstract

The invention discloses an open hole staged fracturing well completion pipe string provided with a controllable valve and a hydraulic control switching pipe string, which are suitable for well completion processes of horizontal wells and straight wells. The hydraulic control switching pipe string is tripped to open and close the open hole staged fracturing well completion pipe string provided with the controllable valve, so that multilayer-section fracturing well completion construction is realized, and development requirements of low-permeability oil reservoirs and unconventional oil and gas resources are met. The pipe string is sequentially connected with a drill stem running tool, a top suspension packer, a hydraulic control switching retention cylinder, a switchable control valve, an open hole fracturing packer connected with the control valve, a shaft isolating valve and a bottom circulating valve from top to bottom by using a bushing. The hydraulic control switching pipe string comprises a hydraulic control switching tool and a continuous oil pipe; and a set of hydraulic control switching tool is connected to the bottom of the continuous oil pipe. The switchable control valve has the internal drift diameter of the same size; sand fracturing well completion can be performed on a stratum by using the bushing; and thus, requirements of large-displacement and large-scale fracturing reconstruction are met, the crack length, the crack number and the flow guide capacity are increased, and the production capacity and the recovery ratio are effectively increased.

Description

technical field [0001] The invention relates to a well completion device in the petroleum industry, especially an open-hole staged fracturing completion string and a hydraulic control switch string with controllable valves, which are suitable for the completion process of horizontal wells and vertical wells. Open-hole segmental fracturing completion strings with controllable valves are installed on the switch strings to realize multi-stage fracturing completions and meet the development needs of low-permeability reservoirs and unconventional oil and gas resources. Background technique [0002] At present, the use of horizontal well staged fracturing technology to improve the development and application scale of unconventional resources such as low permeability reservoirs and shale oil and gas is gradually increasing. However, the currently commonly used horizontal well open hole packer staged completion technology, such as: the application number 200920248979.9 of the horizo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B34/14
Inventor 吕玮王增林张全胜李玉宝叶金胜曹雪梅贾庆升吴柏志王世杰吕芳蕾
Owner CHINA PETROLEUM & CHEM CORP
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